:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a2035;
  --bg-hover: #1e2a42;
  --border: #2a3555;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #06b6d4;
  --accent-hover: #22d3ee;
  --accent-dim: rgba(6, 182, 212, 0.15);
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

.app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 240px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  z-index: 100;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon { font-size: 1.5rem; }
.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-sub {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.nav-links {
  list-style: none;
  padding: 1rem 0;
  flex: 1;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.2s;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-links a.active {
  color: var(--accent);
  background: var(--accent-dim);
  border-right: 3px solid var(--accent);
}

.nav-icon { font-size: 1.1rem; }

.sidebar-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
}

.sync-status {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Main Content */
.content {
  flex: 1;
  margin-left: 240px;
  min-height: 100vh;
}

.content-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.content-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

.content-body {
  padding: 2rem;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: border-color 0.2s;
}

.stat-card:hover {
  border-color: var(--accent);
}

.stat-icon { font-size: 2rem; }

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

/* Toolbar */
.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.search-form {
  display: flex;
  gap: 0.5rem;
  flex: 1;
  max-width: 500px;
}

.search-input {
  flex: 1;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--accent);
}

.search-input::placeholder {
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.data-table tbody tr:hover {
  background: var(--bg-hover);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.sort-link {
  color: var(--text-muted);
  text-decoration: none;
}

.sort-link:hover, .sort-link.active {
  color: var(--accent);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.highlight {
  color: var(--accent);
}

.empty-state {
  text-align: center;
  padding: 3rem !important;
  color: var(--text-muted);
}

/* Details Panel */
.user-details td {
  padding: 0 !important;
  background: var(--bg-secondary);
}

.details-panel {
  padding: 1.5rem;
  animation: slideDown 0.2s ease;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
}

.details-grid div {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.details-grid strong {
  color: var(--text-primary);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-info {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--accent-dim);
  color: var(--accent);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}

.badge-error {
  background: rgba(239, 68, 68, 0.15);
  color: var(--error);
}

.badge-type {
  background: rgba(129, 140, 248, 0.15);
  color: #818cf8;
}

/* Error cell */
.error-cell {
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.8rem;
  color: var(--error);
}

/* Section */
.section {
  margin-top: 2rem;
}

.section h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.actions-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Tree */
.tree-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.tree-node {
  margin-bottom: 1rem;
}

.tree-referrer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
  margin-bottom: 0.25rem;
}

.tree-wallet {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.tree-children {
  padding-left: 2rem;
}

.tree-child {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.5rem;
  font-size: 0.85rem;
}

.tree-volume {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-left: auto;
}

.muted {
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    width: 60px;
    overflow: hidden;
  }
  
  .sidebar-header { padding: 1rem 0.5rem; }
  .logo-text, .logo-sub { display: none; }
  .nav-links a { padding: 0.75rem; justify-content: center; }
  .nav-links a span:last-child { display: none; }
  .sidebar-footer { padding: 0.5rem; text-align: center; }
  .sidebar-footer .btn { font-size: 0; padding: 0.5rem; }
  
  .content { margin-left: 60px; }
  .content-body { padding: 1rem; }
  
  .stats-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }
}